Anyone have twins or children close in age??

I’ve just obtained guardianship of my nephew, he’s 2. My son is about to be 2. Currently we are all sleeping in my bed. I was trying to transition my Lo to his own bed in his own room, he will wake up around 2am and come to my bed. My nephew has his own room and will sleep anywhere. I want them to share a room but I’m not sure if I should get toddler beds or twin beds or could they share a bed for a while since they’re small?

My nephew was abused and I dont want him to feel like I’m abandoning him(that’s why I thought having them share a room would be good)

He was locked in his pitch black room every night and had to cry himself to sleep.