As fun as it sounds to have 2 different species together it's a bad idea . But to answer the social question-- I have 2 whites about the same size and at the beginning my oldest frog was curious of the smaller Ones every waking move. But over Time they have gotten used to each other and it seems to me like they enjoy sitting together still sometimes! :P also if you have 2 MAKE sure to monitor their eating(don't want the bigger one eating all and the younger starving) but two whites together are fun to watch for sure good luck getting your mom to agree!