Yes BioDad will be able get CS from your wife. Very likely not from you though. At least it is extremely unlikely.

Since your wife does not work the Judge will likely impute at least a minimum wage income to her and use that to calculate her CS obligation. That is if she has no skills, it could be higher if she is a trained or educated person. In which case the Judge could impute an income to her in line with the reasonable income of someone with her skill level.

An interesting characteristic of the Income Shares model which most states use (except for Delaware) to calculate CS is that the total amount allotted for support of a kid is based on the total combined income of the BioParents and is allocated on a % basis with the higher earner responsible for a larger share of the child support dollar. If the NCP is the higher earner then their CS obligation is comparatively large and vise versa. The interesting part is this. Even if the CP is significantly the higher earner the NCPs actual CS obligation will go up as the CP's income increases even if the NCP's income does not increase.

Go to your state's online CS calculator and play around to get an idea of what the likely outcome will be if BioDad goes after CS. If the CO is not issued by your state go to the calculator for the state with jurisdiction over the CO. This is how I discovered that as my brides (Dual major BS, MBA, CPA) income increased the SpermIdiot's (Voluntarily intermittently employed licensed plumber) CS obligation increased though his income did not.

Hope so. BioDad should pay for 1/2 and BioMom (your wife) should pay for 1/2 of ALL care for this teen.

BioMom (your wife) currently chooses not to work outside of the home, but that does NOT change her requirement to ensure food/roof/healthcare for the child she created. Don't forget braces, tutors, contacts, dermatologists, psychologists, sports, summer camps and then higher education (college).

The state may charge BioMom with past due child support if BioDad claims food stamps, HUD housing, CHPS+ benefits.

Parenting classes may be cheaper.

If you would like to play "what if" see if your state has a child support calculator on their website. In my state, unemployed, underemployed parents still owe child support. Incarceration may be cause to reduce support, but it still accumulates.

make it very very clear to SD - once she moves, she can not return...... visit yes, permanently back hell effing NO...

see she believes Daddy is less strict then mommy...after the honeymoon is over, 3 months, SD will ask to come back..

but your income is safe

Talk to your lawyer. If Mom has custody of the one teen that's 15 and Dad takes custody of the problem 16yr old, child support may be a wash. Your wife needs to get the change properly filed though and any current CS that now stands for the two children to reflect the changes.

Yes.

Yes your wife should be paying and can be ordered to by a judge. Children cost money and where there are 2'parents they are both responsible for the financial burden, not just the father. If your wife is not working then child support will usually be calculated on her earning minimum wage for 40 hours a week. This may vary though depending on your state or her ability to earn a higher income or other factors. As always, talk to a lawyer who knows the laws where you are.