He’s afraid to tell his daughters

I became engaged on November 2nd and had a secret city hall wedding with my husband on the 16th. The reason for the secret marriage is that I carry good insurance and my husband is a self employed attorney with recent health problems and I wanted to help. This is his 3rd marriage and he has two daughters ages 17 and 20 from his first marriage. I have been divorced for 14 years and had 4 kids in that marriage. I am awaiting my annulment and we will have our “official” wedding in December 2024 regardless of the outcome.
My husband has a strained relationship with his daughters and is afraid to tell them about our engagement. I have resentment because they are the reason for the wedding having been a secret in the first place. He had eloped with his second wife which caused friction with his kids and he is now tiptoeing because he doesn’t want to lose them forever. The 17 year old hasn’t talked to him in 2 years and the 20 year old reaches out when she needs something. The two times that I have been in her presence, she has been disrespectful to me yet he won’t address it because he’s afraid of losing her. I highly doubt that they will even come to the wedding although they will have a place in my bridal party if they choose to.
Bottom line I feel the longer he waits to tell them, the worse it will be for him. Am I wrong?