Reese Witherspoons mom is still legally married to her dad, and she is suing him for bigamy because he remarried. Sounds like a huge mess. Reeses mom Betty is accusing him of bigamy in court documents filed this week. She has asked to have his new marriage annulled. Reeses mom explains that shes still in love with Reeses father. She thinks Reeses father is suffering from early onset dementia and has troubles with drinking, hoarding and finances.