Not all of his relationships with his family were so negative, but there seems to have been a great deal of underlying tension. As he says in another letter to Liela, "Stranger still that my (our) family should always (nowadays) seee mee in terms of $ and c....tho before I guess they saw me in terms of 'problem child'... or an orphan of sorts. TO ME....I'LL ALWAYS BE.....ME" (misspellings and punctuation copied from original letter). From his letters and other references his fondest family memories were of an aunt and uncle in Scotland. He makes numerous references to missing Scotland and will sometimes even attempt to write in a Scotts "accent".
Of course anyone reading this is going to want to know what the book reveals about his relationship with his fellow Beatles. (If you don't know their names I doubt you're reading this review, but for posterity's sake they were Paul McCartney, George Harrison and Richard "Ringo Starr" Starkey.) While nothing new is really revealed, it's obvious he remained very friendly with both Harrison and Starr while relations with McCartney never really recovered from the termination of The Beatles. Some of this seems to have stemmed from disagreements about who should be handling the business affairs of Apple. Paul wanted to use his first wife's (Linda Eastman) family and the other three became dissatisfied with their handling of matters.
When McCartney wanted to release his first solo album the other three had the record company push back its release date so it wouldn't conflict with of Let It Be. As a letter they sent him shows, they didn't ask him, they just told him they had done so after the fact and they hoped he would understand. While there's no indication as to who instigated the request to the company, it's not hard to imagine McCartney thinking Lennon was behind it. Business aside, the two men hadn't been getting along personally, as a letter from Lennon to and about McCartney show. Part of it seems to stem from McCartney and his wife's attitude towards Lennon's new wife Ono and how much their apparent rejection of her hurt him.
Anyone the least bit familiar with Lennon's writing will know he was fond of both sarcasm and nonsense writing. This tendency was established early on in his life as can be seen in the reproduction of the parody newspaper he produced in grade school called The Daily Howl. As you read through the book and the years pass by you gradually realize how little he changed as he aged. The grammar and spelling might have improved somewhat (although as Davies points out it's sometimes hard to tell whether mistakes are deliberate or not) but the same sort of childish humour continued to prevail throughout his life. In some ways this is funny, but in other ways it shows a disturbing tendency to not mature.