Hello, firstly thanks for listening to me ramble! I have just rehomed my cat and I am absolutely heartbroken. I am currently living with my partner (and his family....not the best situation, I know!) who has a young daughter (she doesn’t live here but comes to visit once a week). To cut a long story short, we have been together for two and a half years (saving for our own house) and his daughter has recently started showing allergic symptoms to my cat, Sammy.
I don’t have much family myself so don’t really have any alternative living arrangements at the moment, so I have really been pushed into a situation I’m really uncomfortable with. I have had to rehome my lovely cat with my partner’s sister - who is lovely but has two children (sammy is not used to kids and gets quite nervous around them). He has so far been living there about a week and a half and so far will only come out when the kids are at school, and is so far definitely not keen on them. He would never hiss or show aggression (he’s a sweetie and wouldn’t hurt a fly), but will stay in a bedroom whilst they’re around. I feel absolutely devastated and keep worrying he won’t settle in and will be miserable.
I know I’m very lucky I am still able to see him, but feel a bit selfish for homing him there now. I am so upset I’ve been considering taking him back and moving out, but this would mean my partner and myself could essentially never live together. I kicked a huge fuss about rehoming sammy in the first place, but my partner is concerned his daughters allergies could be dangerous (and he has troubles with his ex too which makes the situation worse).
Anyway - sorry for the long rant! I am just concerned sammy will never get used to his new home and I’ve made a massive mistake, I am just so heartbroken and miss him so much  Any advice would be so appreciated!