When i got my first baby, my daughter back then was only 14, in the beginning she was in ahhh, but that wore off after only 2 days of pottie training, teenagers dont want that responsiblity, then it was ok mom im not ready for a dog, i hope for the dog sake they get a bigger one, we all know 2yr olds are a lot of work, i have to watch my grandson arounds my furkids like a hawk, hope things work out ok, and i understand about your sis, good luck to you