If a person dies intestate in TX with children and a 2nd wife does 2nd wife inherit a share equal to the children if the marriage was less than 10 years?

I can not see any circumstance, short of a will being available, where the children would get anything that the wife does not wish to give them. If the Children are minors, and were under his care, she would be responsible for them. If the children were not under his care, child support would have been given. After death, they would receive SSI until they are 18.

If the children are over 18, they would not have a legal stake, unless a will was made available showing they did.