It's part of a deluded attempt to portray Jeremy as someone who loved his family, whereas people who knew him at the time said the opposite, that he hated his family.
That's not true. He did have a good relationship with Nevill.
In regards to shelia they were close when younger, but drifted apart and mixed in different circles. Pretty normal to be honest.
Accept he had a difficult relationship with June, so did Shelia.