I posted here once before. I have 3 kids, two girls(ages 11 & 6) one boy (age 10). My SO has a son the age of 6. I've known my s/o for 5 yrs, started dating 2 yrs ago and moved in together for one year. We agreed that boys will share room and girls will share room. My S/O still keeps all of his sons belonging in our room and he takes a shower and his towel and stuff are in our master bathroom. His boks, papers, etc is there too! He claims the reason why he has it there is because my son is messy and he doesn't want his kids son in my sons mess.