My parents want to buy me a house but only if I leave my husband

Husband and I have been married 10 years and have three year old twins who are both on the spectrum. When my boys were diagnosed I quit my job to become a SAHM so I could be present to take them to all of their therapies and appointments. We are currently renting our house because we currently only have one income and not enough savings to buy just yet. My husband makes very good money though so we live comfortably.

My husband took our boys’ autism diagnosis very hard and our marriage suffered as a result. We are now in counseling to try and salvage it and it has helped to an extent. I currently have an IUD but my husband has refused to have sex with me for 4 months because he’s terrified of getting me pregnant again. All he wants is oral sex (for him only and only while he watches porn as I do it) and he said he doesn’t think that will change anytime soon because he can not “risk another pregnancy”. I know for a fact he isn’t cheating and I don’t think it’s an attraction issue because I look almost identical to how I did when we first got together. I work hard on my appearance and work out everyday while my boys are at preschool.

My husband is a good provider but not an extremely present father. He tries with the boys(but has very little patience) but he told me (when they are in bed) that he didn’t sign up to raise special needs kids and he cries about them being autistic during these conversations. We’ve been working through it in therapy.

My husband worked nights last night so my parents came by to see the boys (who they absolutely adore) and they sat me down and told me they want to buy me a house. But they only want to do so on the condition I leave my husband because they don’t think he’s good enough for me or the boys. The said they want to set me and the boys up for the future and give the boys something that’s theirs for when me and them are no longer around.

I have no idea what to do. Part of me thinks it’s wrong to accept and I should work on my marriage but the other half of me wants so badly to give my kids the world and I feel like I won’t ever get another offer like this. What do you think I should do? Do I stay and try to save a marriage that may be beyond saving or do I take my parents up on their offer? They told me I can take my time thinking about it but wanted to do this for me and the boys only, my husband is no included in the deal.