It would be clear that Maureen would prefer not to have a positive relationship with both her sister and her former husband given the ups and downs of their past. But she chose forgiveness and had a cordial relationship with her sister, putting aside all the bitterness she had to deal with over time. Maureen gets along well with her sister these days.
Speaking of her relationship with Robert, they continued to get along well. In actuality, she and her ex-husband had a close bond. She even went to see Robert perform live in the UK in 2010.