This made me go back to the Lascelles family and it remains a rather sad story: only one of the children and grandchildren of the couple did NOT get a divorce... and more often than not the second marriage took place within a year of the divorce of the first spouse - and several of them had children out of wedlock, sometimes while married to someone else (but got married to their mistress later on).
Son 1: George married firstly Marion Stein in 1949. Marriage ended in divorce in 1967 - a few years after the birth of a son by his mistress (1964).
George married secondly his mistress Patricia "Bambi" Tuckwell in 1967.
Grandson 1.1: David married firstly Margaret Messenger in 1979; they were divorced in 1989. He married secondly Diane Howse in 1990.
Grandson 1.2: James married firstly Fredericka Duhrrson in 1973; they were divorced in 1985. He married secondly Lori Lee in 1985; they were divorced in 1996. He married thirdly Joy Elias-Rilwan in 1999.
Grandson 1.3: Jeremy married firstly Julie Bayliss in 1981; they were divorced in 1998. He married secondly Catherine Bell in 1999.
Grandson 1.4: Mark married firstly Andrea Kershaw in 1992 and divorced in 2005. He married secondly Judith Ann Kilburn in 2011.
Son 2: Gerald married firstly Angela Dowding in 1952; they divorced in 1978. He married secondly Elizabeth Colvin in 1978.
Grandson 2.1: Henry married firstly Alexandra Morton in 1979; they divorced in 1999. He married secondly Fiona Wilmott in 2006.
Grandson 2.2: Martin married Charmaine Eccleston in 1999 and is the only one of either the sons or grandson of the former princess royal who isn't divorced - but like several of his family members, he does have a child out of wedlock.
Hopefully their great-grandchildren and great-great grandchildren will fare better.
Note: Of course, her brother Albert (the later king George VI)'s children and grandchildren's marriages or those of her other brothers haven't all been successful either but still did better than the Lascelles family.
Albert's children & grandchildren: 1/2 children divorced; 4/6 grandchildren divorced
Mary's children & grandchildren: 2/2 children divorced; 5/6 grandchildren divorced
Henry's children & grandchildren: 0/1 married children divorced; 1/3 grandchildren divorced
Edward's children & grandchildren: 0/3 children divorced; 2/7 grandchildren divorced