It's an awful thing to have happened, but I don't think your son has been at all fair in taking it the way you describe. You and your husband are the older people, relatively set in your ways, and not so easily able to understand what makes other people 'tick' - especially not younger people. Whereas, your son and his wife are the younger energetic pair, and they should be flexible and adaptable in a weay that nobody can expect you to be. In short, it's up to them to understand you, and accommodate exactly what suits you; it's absolutely definitely NOT up to you to be so understanding with them and with what they think their own needs are. Best wishes.