Husband and wife should be equal. Your wife earns more, so in order to be
equal, she should only contribute the same amount as you do to your small
family. Your wife should set aside or give her family 30000 each year. So
that each of you contributes 50%, 50% to your small family. Then you two are
even.
Now that your wife brings 30000 more home each year. She bought gifts for
her family about 2000$. That means she brings back 27000$ more than you.
Your mother brings 10000. That means she brings 17000$ more than your side.
Your mother buy gift 200$. That means she brings 17200$ more than your side.
Because of the 17200$, your wife still has the right to talk about whether
your mother should buy these gift or not.
It is not a matter of how rich the couple is. It is about whether it is fair
when distributing the wealth.
Obviously, this husband took granted that his wife shouldn't interfere with
the $200 gift purchasing, because she did $2000 to her family. The husband's
viewpoint is narrowed because he forgot that he earns $30000 less.
Who has more money who talks. The husband should earn $17200 more this year
to be equal with his wife.
Those who talks about divorcing should have a rest because this husband is
obviously enjoying the money his wife brings home.