Silly thing: my little sibling calls me "weird" like "That's so weird!" "Why are you always so weird?" etc etc, and it pisses me off because i KNOW what you're trying to say. Just say it man...
So instead of dealing with blood-related people, you'd rather deal with foster parents? In both cases you're playing the gacha of life to get a nice (foster) family.
And the next time your little sibling calls you weird, just reply with: "I love you too," and just move on.