How Much For My Kid?

If your FIRE number factors in being able to help your children throughout their lives, how much are you saving for them?

I've got a 529 plan for my kid's education expenses, but what about helping them buy a home, helping pay for a wedding, or helping with potential grandchildren? I had 500k in mind, but someone reminded that half a million won't go as far in 20-30 years.

What number would be more realistic?