Prior to 1991
Before 1991, the question of do illegitimate children have inheritance rights was answered differently than it is today. In Texas illegitimate children could only inherit from their biological parents if the parents eventually got married or if the father acknowledged the child through some authorized manner.
The Supreme Court has declared unconstitutional those statutes that limit illegitimate children’s inheritance rights . However, there are still many problems for illegitimate children to gain their rightful inheritance. I have written about this issue on my web site here.