What happens to my money when I die if I have two families? In other words, my ex-wife and children in my first marriage and my wife and children in my second marriage? How is it being allocated?

Depends on whether you have a will in place. Do note that remarriage would automatically revoke any existing will, meaning any will written prior to remarriage no longer valid.

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If you have a will in place, distribution would be done according to your wish stated in the will.

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If you don't have a will, then distribution woule be done according to Intestate Succession Act. You current wife will be entitled to 50% of your estate, and all your children (from both previous and current marriages) will be entitled to equal shares of the remaining 50% of your estate.

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Reference article:

https://www.ilawyer.com.sg/divorce-101/decided-...