Penis/vagina questions from young toddler

Jonah

So my son is 20 months. He knows what his penis is, he calls it his “peepee”. BUT he’s recently noticed dada also has one. He points and asks “what’s that?”. Since finding out dada also has a penis he’s been pointing to MAMAS parts and asking “what’s that?”. Do I just tell him? Like you and dada have a penis because your boys. Mama has a vagina cause she’s a girl. He’s so young idk how to approach this. I’ve just said “MAMAS parts”. Please help lmao