Wife can spend her salary the way she wants, however the husband cant do the same and has to maintain his wife and kids out of his earnings.
Did you not inform your husband that you would support your parents financially even after marriage ?
Is he simply objecting because of financial constraints or for any other reason ??
You should have ONLY got married to such a man who would support you in this aspect. It seems evident that your husband has issues & now you want legal opinion. This will create conflicts and then grounds for trouble in marriage. People get married by taking the other partner for granted by not discussing important expectations out of marriage and then later going legal to fulfill their demands.