Kids as a retirement investment - makes sense in countries that lack safe investments (safe from over-taxation, theft, inflation). Built in interest/growth rate due to breeding next generation.

Unfortunately I have shorted the children market by not breeding when younger. What's the appropriate way to invest in 2.5 children? I presume they are a very illiquid investment.

The other problem with cousins is that brothers and sisters move to distant locations so cousins are often inaccessible even if you have them.