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Well the two most important things are that you and your husband should be supportive of the both of them and secondly, don't get paranoid about your husband turning into his dad. Even if they stay separately, they had a good relationship run. Life is too short to compromise on the company you keep. If you love them, put their interests before yours and wish for them to be completely happy as people. And at least they raised a darn fine son.
For instance, my mom and my boyfriend's dad are both nutty toxic people. We know that and accept the way they are, but we also know that we will never turn into them. Why? Because we are intelligent thinking and aware people and we care about not turning into them. Our parents don't care that they are the way they are and there is no room for their self growth. They also both love their cocktails and we are essentially non-drinkers.
There is a lot more involved in marital sex that just sex usually. There is trust, intimacy, love, playfulness etc. It sounds like she is or has fallen out of love with him and that he is not only physically but emotionally distanced himself from her. With men sex is more physical, and with women is is more emotional. He is not meeting her needs and Viagra will only fix a small part of it. The picture is bigger than it just appears.