My exH and i split a few years ago. Our DD was a young teen at the time. ExH moved away, but DD has seen him regularly ever since we split.
It has recently dawned on me how much exH relied on me to maintain the relationship with his family. DD hasnt seen either of her grandparents on his side for about 3 years. I know my ex isnt even in touch with his brother any more.
DD didn't have a close relationship with the ILs as we live far from them, but it was warm and loving, and i feel sad for her to lose that. I even feel a bit sorry for my exH as he is clearly crap at maintaining family ties.