In Estate of Gibson, a man named his sister as the beneficiary of his retirement plan in 1989. No. 06-17-00059-CV, 2017 Tex. App. LEXIS 9963 (Tex. App.—Texarkana October 13, 2017, no pet.). The man married in 2003, but failed to change the beneficiary designation. When he died in 2011,…