Hello E.,
In my opinion based on what i've read from you in the couple of requests you've sent in, Your baby boy is having anxiety problems not bladder problems. His entire life is upturned beginning with now living with friends of his parents. He is not in his own home,probably not sleeping in his own bed, having to follow somewhat different rules perhaps. Anyway, everything is changed including his mommy now having another baby. Although he doesn't want pull-ups because he associates those with babies, he still wants attention from anyone who will notice him. it's quite typical of a small child. I suggest no pullups, no diapers. perhaps use plastic sheets to cover the mattress under the bed sheet. let his daycare workers know his life is in a bit of a change right now so they will have more patience with him. And do the same for him. Be more patient, spend more time with him alone to chat, to listen, to watch his behaviors, and attempt to identify what it may be he is feeling even if he has no words to express himself.
Love him as much as possible, showing him as much as possible. All will return to normal as soon as his life returns to normal. And if you plan to be living with friends awhile longer, for whatever reason you may have for doing so, your baby will adjust in time. He also picks up on your anxiety and the feelings of all the other adults around him in this home. It's never easy to live with another fmly who has rules different from your own. But kids adjust as soon as you do!
take care and good luck. God Bless you all...
sincerely,
D.