[endymi0n]

Adding money might help. We have a small scale investment in our cap table from a German family who have kept their money together for 650 years…

[jjeaff]

Seems like the greater feat would be keeping your family size small over 650 years. Most any level of wealth will start to fade if you have to split it amongst 1,000 heirs.

[bombcar]

Hence the effective disinheriting of second or third sons of noble houses (the old saying was something like heir, army, priest).