Thank you all so much for sharing your stories here. I've slowly been going insane, thinking I'm the worse person in the world for the struggles I've been having as a SM. I thought it was my own jealousy and insecurity that made me react badly to the actions of my SKs and even my DH, but I'm learning that these things are actually quite common for blended families. It nice to know that I'm not just overreacting to our situtation, and that it is totally OKAY for me to expect certain boundries and question things that make me feel so uncomfortable in my own home. 

... from SS19 living here, disrespecting our home, lying to me and DH in our home, coming home high & with his still-illegal-at-his-age weed stash, not cleaning up after himself or in any way contributing to the household upkeep (or even his own laundry and personal hygiene!), manipulating for money and rides, etc.