I need some advice from other step-parents, seriously! I live with my SO & we share household expenses equally. His 27 year old married daughter is graduating from college and wants to move back into our home rent free & bill free indefinintely along with her husband and three cats. The two of them are not good housekeepers at all! I met her once and she seemed like a lovely girl, however, once I moved in with her dad her attitude changed and now not even common courtesies come from her side. No plan is in place and nothing has been discussed with me.