I need help. My Fiance's 19 year old rude, disrespectful daugher lives with us.?

I have been with my fiance for about 14 ys. His daughter now 19 has been rude & disrespectful to him since we met and to teachers. She & her mother can't get a long, they argue & fight, so right after we had our now 4yr old daugher he had to bright idea to have her live with us. He makes excuses for her rudeness, he's paid for private schools,tutors & she still failed. he has paid for summer school every year and she finaly passed. He's never taken priviliges away when she failed or broken the house rules like eating/leaving food in her room. We had fruit flies in the whole house. Maggots were in her trash because she left chinese food in her room and lied and said she wasn't eating in there. I found used condoms in her room. I found empty marijuana package and blut roll up & cigar tobacco in her floor. He makes treats but never follow up. she calls our 4year names and gets her upset and now we had a big blow up. He'sa great guy but too laid back. but now I may leave. Help

Don't you know that your little four year old can be taken away with those conditions, and with drugs in the house??? If someone calls Child Protective Services, you will loose your child!

That 19 year old needs to get moved out! She is a horrible example to her little sister.

What if your little girl goes and finds drugs and swallows them, you take her to the hospital and they find it in her system....bye, bye daughter!

Your finance needs to wake up and see what he is neglecting to do. That 19 year old is ruining your relationship as well. She needs to either cooperate with the family, or move out and stay out. Daddy needs to wake up before something happens that cannot be fixed.

You tell him straight out she goes or i do this young lady needs to move out she is using you all and the affect she will have on your baby is not good either your husband needs to put his foot right up her tail and out the door.
She is doing more damage than good for all in this home she is damaging you all mentally emotionally and soon to be physically if she keeps living there as long as she is allowed to do so she will.

Sounds like he needs a shock to get him started in sorting her out. Sounds like you've 3 kids! Maybe if you were to leave and let them sort it out for a few weeks they may realise how much you do. You don't have to split up, just get some space.

He needs to understand that she is an adult now and she needs to get out she is being disrepectful a