A friend wrote you the following letter:
"Our baby girl Nat was born last year in March. If you multiply her age by those of her older sister Kat and brother Pat, the product is 36. If you add all of their ages together, you'lll get a sum of 13. Everyone is healthy and happy. Write back soon!"
What are the ages of Nat, Kat, and Pat?
3 hints if you need them, gogogo.