I think we're all happy to be "used" like family, u/d. Good to hear more on the situation. Caring thoughts and prayers still coming your way and your Dad's
My heart and thoughts go out to you. I think it's great that you managed to have such a respectful and loving relationship with your step-dad. I hear you on biology... I was adopted and my adoptive parents are my true parents. I have not yet had to face any major health issues with them but I know it will be hard when I do.
Please take care and I hope you and your family stay well.