My hubbys will???and the angry ex. wife and daughter??

My husbands ex. wife whom he married twice and mother of his 16 yr old daughter is extremley upset with me!I have only been married to my hubby for a year and half but he has put me in his will as the sole beneficiary and executor(sorry not sure if the ex. wife used the right words).I am 24 going on 25 and my husband is 14 yrs older than .He just had a heart attack and was diagnosed with lung cancer so i am worried about his health and dont want to complain to him about his ex. wife's nasty phone calls and his daughters acting out when she is visiting.My hubby says if he were to die before his daughter is 18 yrs old her mom and her will recieve a lump salary of child support but thats all.He said it would be my choice if i wanted to give anything else to them.I dont feel comfortable with this?should i just ignore it?