Brother autistic, would my child

Hey, so im not married yet but I love my boyfriend a lot, like a lot, and i havent told hik that my brother is autistic. My parents are well off so finances won't be a problem for my brother but i am scared that he will be disappointed and worried in his future with me. The more I love him, the more this possibility bothers me as we talk about our future as a definite thing at times.