I guess I'm "little dad" 😂

Me and my husband are foster parents. We have two brothers we are in the process of adopting. When they were with us for a while since me and my husband are both men they asked what to call us and we both said whatever they want. They're 5 and 7 and they have recently started calling us Big dad and little dad. My husband is 6'5 and very muscular. I'm 5'6 and a half. Not very muscular. So they have named me "Little Dad" 😂