It's a matter of the child's knowledge and preference. Usually kids aren't taught that one can have two dads. His general knowlege says there only papa and mama. So if daiki is "papa" then minjoon must be "mama" even if he is a man. Even if you teach him to change his way of calling he prefers the word "mama" . By the time the child grew older will then he will call minjoon "dad".
Thats not true. My sister has a kid with her girlfriend, and her kids calls both of them mom. Kids know it very well, maybe toma just likes to call our uke mama
just like I said. He prefers to call him "mama". I'm just saying that his prior knowledge made him prefer that.
thats so cute omg
can't toma also calls him dad or smt ╥﹏╥