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Maybe I misunderstand you, but this is imo calculated the wrong way. Presumably, most of the dudes family is also 130 IQ, and you already explicitly spelled out that her parents and siblings are all 130 IQ. If the expected child IQ of a 130 IQ pairing from a 130 IQ wider family is actually 118 ... What astronomical luck did the families have up to then?
First, heritability is a red herring, since we're not in an adoption study or similar situation. These are rich parents raising their own rich daughter. The relevant factor is regression to the mean, which is generally estimated to be ca 0.5, i.e. if you take your spousal IQ_s, and compare it to the population mean IQ_p you're descended from, then you're kids IQ will be roughly (IQ_s + IQ_p)/2.
The population mean you regress to is generally speaking that of your actual sub-population, which is your wider family; Ideally you also know the IQ of your grandparents and uncles and aunts, that improves the estimate further. It's not always 100, which is a very common misconception. It's generally trivially acknowledged for clear examples, such as ethnic ashkenazi jewish among gentiles, but it even holds among seemingly homogenous groups. The reason you see regression towards 100 is partially that assortative mating in superficially homogenous groups is only moderate, so usually there is some difference between the respective spousal family background, and partially an artifact of averaging. But it certainly holds for ethnically separated groups with rather strict assortative mating as is typical in large parts of India, as I understand it.
So the expected child IQ of a 130 IQ pairing from a 130 IQ wider family is simply 130. With a single spouse at 90, the spousal average becomes 110 instead, and the final number after regression is around 120. Still a 10 point difference though, so I guess not a big difference on that account.
Goddammit, I knew I'd done something wrong. I was actually aware that it's not correct to use the population mean of 100, but I was unsure how to account for it. Thank you for the correction.
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