Helping his brother pay bills so we can be out on our own.

My boyfriend thinks that we should help his brother pay his bills if it means that we will be able to move out on our own. We are currently roommates with his brother and we have a 16 month old with a newborn due in July. Our original plan was to be moved out before the baby is born, but now we might stay until September to make sure we have a bit more money. Anyway, we are having trouble with his brother figuring things out to move separately from us. He was not saving and he always dodged the topic when we spoke about moving out separately. My boyfriend thinks he doesnt want to move because he has never been on his own and the thought is scary for him. Option 1 is that their sister flies to where we live to take a police officer test in July which is when it is scheduled, and if she passes, her and his brother move in together. Our last option, according to my boyfriend, is that we will make a deal with his brother to help pay his bills if it means we are moved out separately. That last option just blows my mind because, 1, his brother has the resources to move out. They have a well-off family to be able to support his brother if it means he cant pay his bills. I feel like it is stupid for my boyfriend to decide for us to help his brother with bills when we have a toddler and newborn on the way. I told him if it comes to that, to use his own money, separate from ours to help his brother. If it comes to that and his brother accepts the money, id be upset because there should be no reason that his brother cant deal with bills himself and accepting money from his brother who is trying to keep a roof over his kids heads. We dont have alot either but we are figuring it out. Out of all my boyfriends siblings, my boyfriend included, his brother was the one to graduate a 4 year college and he has a good side job writing for a movie blog and gets flown out to interview celebrities such as dwayne johnson, ryan reynolds, etc. He also has another job working at a restaurant, but with a degree, why even do that?? My boyfriend and i work minimum wage jobs to support our family and I feel like his brother is a burden. I didnt ask to worry and support a 28 year old man while i am 22 year old trying to figure my life out.