Why are you disappointed?

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My husband and I are both 24 years old. We live in our own place, own our cars, I’m a stay at home mom while my husband has a great full time job. Recently we found out we’re expecting baby #2 our son will be 1 in January. We are both exciting and let our parents know and my father and his wife responds by saying they are so disappointed! I can’t wrap my head around why it would even concern them at all?! I didn’t even mention anything because I didn’t want to lose my shit

Update: my fathers wife said our marriage will likely fail having two kids because “two kids is like having 3 1/2” 🙄🙄🙄🙄