Having read this whole thread, I do feel some of you are being very quick to judge. Everybody's circumstances are different.
My DF died when I was 3. I had a DS of 13 and DB of 10. When I was about 6 my step-father moved in with my DM (although they didn't actually marry until I was 12). My DF had a DS and a DD (the DS was the same age as my DB and the DD was 2 years younger).
In time, my DM and DSD moved and bought a house together, although it was mainly my DM money as my DSD was paying a great deal in maintenance (both his children were at private schools). His ex-wife had a boyfriend but wouldn't remarry as didn't want to lose any maintenance. When DSD mother died, the money from the sale of the house and many of the possessions were split between his two children.
My DSD saw his son about once a month but, once she reached a certain age, his daughter chose not to see him. Eventually, instead of paying maintenance, my DSD agreed a huge sum of money to "pay-off" his ex-wife. At this time, my DSD had taken early retirement to care for my mother who had multiple sclerosis.
Without going into detail, the years passed and I was the one who visited my parents regularly, helped them out and checked they were ok. My step-brother visited about once every 6 weeks and, when he married, fell out with his own mother. When my parents moved in 1998, they discussed certain aspects of their will with me. My step-brother and I were to be joint-executors and when one parent died, the money would go to the other one. On the death of the second parent, there was a bequest of £10,000 for my step-sister and the rest of the estate was to be split 4 ways. This was because my DSD knew his daughter would benefit from her mother's will in time, so wanted to make sure the rest of the children received an equal share.
My DM died in 1999, when I was 30 and my DSD died in 2006, whilst visiting my DS in Canada. Although everything in the will was carried out as requested, my step-brother couldn't wait to get hold of the money - although it was left to me to deal with all the work. We were never close, but after that, I have had very little contact with him - I was probably the one most emotionally involved in the loss of parents and at the time had children aged 11, 9, 7 and 2 months, yet all he was interested in was getting the money. I certainly learned how greed and the love of money can show a person's true colours.