u/Big_Lengthiness_4920

I'm looking after my parents younger brother's sugar glider a couple months ago it's partner died since I've gotten him he's been very skinny and shaky I've been feeding him eggs blueberry's and a vegetable although it is worrying how skinny he is I know his cage is to small I'm going to enlarge it and what could I feed him to help.(His younger brother would only feed it random fruit and leave it in there creating a messy place . It's now been cleaned and sorted what do I do) They also cannot afford a new sugar glider at the moment