You need to meet with a professional (an agent) face to face.
You should also meet with a lawyer to draft the necessary legal documents.
If you want to do it all yourself and not pay for professional advice then don't expect professional results.
You really face more significant issues than just how to pass on a lump sum to each child from your first marriage.
What if you and your second husband have children? What if your second husband predeceases you? Will his children/family battle you over his estate? What if your children marry, have kids, divorce, remarry, have more kids, have kids out of wedlock, predecease you etc etc? Do you want a lump sum going to your natural child only (not to their spouse or children? What if your child develops a drug habit? What if your child becomes disabled and has large and on-going medical bills? Do you want to pay those medical bills or do you want to support your child? (two different answers)
Go meet with a professional and discuss lots of "what if" questions.
Good Luck and don't buy your critical financial products online.
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