I really don't know Canadian law but that is really messed up if that is the case.

But I do know that (at least in the US), if you give a disinherited kid a token inheritance (like say $50 or something), that they cannot contest it.

Nope, when daddy kicks the bucket the SKids get SS benefits not CS. I would not pay a cent to the opposition were I the surviving spouse in a blended family marriage. Any support I provided would be at my discretion and paid directly to or for the kid with not a penny going to the opposition in any way shape or form. I would not allow any benefit of my resources to go to the blended family opposition.

Xs and kids are on their own unless the spouses agree and include some kind of CS trust in a Will.

When we did our Wills we made it a point to protect every penny of our assets from my SS's Sperm Clan regardless of how old the Skid may have been when my bride and I may have co-deceased. In our Will each of us is the sole heir beneficiary of the other. In the event that my bride and I pass together everything goes in to trust for SS until he either completes a Bachelor's degree from a regionally accredited institution or turns 40 whichever comes first. Had my bride and I passed before the Skid aged out from under the CO my family would have bankrupted the Sperm Clan fighting for custody of SS. Had the Sperm Clan won custody they would have received nothing from our estate and only would have received my brides SS benefits for SS until he turned 18. Once he turned 18 and was accepted to a college or university our estate would pay his tuition, fees, dorm room, and meal plan, and round trip tickets to visit my family and my wife's family. Any visit to the Sperm Clan would have to be paid for by them.

The skid is now 22 and 3 years in to his USAF career. Our Will stands. He gets nothing if something happens to his mom and I until he either finishes his degree or turns 40. As his mom and I are still alive, kicking, and healthy we definitely give him gifts at our discretion. We give him what we want him to have. Most recently for his 22nd b-day we gave him gift certificates for a bedroom set and living room furniture for his first apartment. He is moving out of the barracks (Dorms in the USAF) and off base.

He is a young man of character and we have no issues with giving him a hand.

IMHO of course.

WOW Now I need to look into my DH will. As well as have one made for me.

I've seen this happen to a dear friend of mine.
So let's set the scene,

Your married and have minor skids, in this scenario or most, it DOES NOT matter what the custody agreements are, a horrible thing happens and your spouse passes away., WITHOUT a will, your skid or rather their representative (usually BM) can and most likely will take half of your EVERYTHING! The only thing exempt would be life insurance policy and that's only if they are not named as a beneficiary.
Seen this happen, could you imagine going through the loss of the love of your life, and all of a sudden being slapped with a court order for half of your savings, Equity of your home, his personal affects, vehicles etc.. ?

After we watched speechless at that, happen to our friend, my DH and I immediately went to an estate attorney to protect ourselves bc his baby mama would do the exact same thing to me while probably smiling the entire time.
The law in our state, says as long as there is a will in place willing something (even just a dollar) then the estate can not be touched by minors or their representatives. Don't get me wrong, the option to contest the will is always there, but not guaranteed a win.
My DH makes a great deal of money, and we are financial comfortable, but with that being said, we have both worked extremely hard, and saraficed a lot to get to this point. I will be damned if a worthless white trash baby mama is going to swoop in and take that away from me and the other children. So we are now protected, to sum it up, our wills ( yes we both have them and also have a joint will, in the case something happens to both of us) states, skid gets a sum of $1,000 and some personal effects ( which are listed specifically in will). Our life insurance polices are also only in our names for beneficiaries, so those are not in jeopardy of being touched. In the event something happens to both of us, we have named family members as beneficiaries that we trust to take care of our children. Now, let me be clear, we are NOT trying to cut out skid from inheritance, it's the BM. She would squander any monetary gain of skid, and eventually he would be left with nothing, DH and I have an agreement, we will follow through with the $1,000 granted in the will, but the surviving parent will make sure that the child is taken care of. For example. If something ( God forbid) happens to my DH while skid is still a minor, I will continue to pay for his private schooling, his uniforms, and I would continue to pay BM child support ( although I wiould decrease the amount ) as child support can not be court ordered after death in our state, and BM would be able to fill for my DHs social security death benefits and would gain money each month from that. I would most likely never see that skid again ( which would be fine by me) but I would stay in contact with his maternal grandparents and make sure his needs were met. I would also follow through with the extras we give our children like a car a 16, bday and other holiday gifting. And a trust fund would be set up for college or adult hood use. My DH and I also both have grown children as well as minor children our wills are set up differently for the adult kids.

I know it's an awful thought, but Step parents need to protect themselves !! Being in a step relationship means there's always an outside person. When death comes so do vultures usually in the form of BMs. Just some food for thought.
If you don't already have something in place to protect you, I highly highly ( can't say that enough) recommend you get it.

We got two separate living trusts, where we will our estate to eachother. We're in the U.S.

Can this be done in Canada?

Ok, so my DH is asking this, just out of curiosity:

Is there any way you could write up papers so that you become divorced upon your death? For example, draw up some divorce papers with your DH and demand that they be filed upon your death and before the disbursement of your WLL?

I know it's a stretch, but sneaker lawyers have ways, and you should find a lawyer who knows a loophole.

Um... you don't have to pay CS in your will. Once DH kicks you should be his sole beneficiary. Once you kick... leave your money to who you wish.

If your CO is that screwed up have your lawyer initiate immediate action to get that resolved.

In our Will we are each the other's sole beneficiary and in the event of our joint demise it all goes into trust for the Skid until he is either 40yo or graduates with a Bachelor's degree from a regionally accredited college or university whichever is first.

Why reward the BM for spawning in your Will? I wouldn't.