The case that you have presented is an Ontario case. I happen to be an Ontario lawyer who does a lot of family law. There are also other Canadian lawyers in this thread who really know their stuff.
Not really. The court frowns upon people sitting in the bushes for extended periods. People who are wronged are still expected to do their best to mitigate their losses rather than be complacent in letting the losses pile up for years when they could have dealt with the matter within a reasonable period of their becomming aware of it.
Theoretically, if cuckold-dad obtained a claw-back order against bio-mom, he could simply sit on it for years before executing aganst her, but courts here don’t work on that assumption – they assume that execution will take place forthwith upon assets being available, so if they are worried that immediate execution would be too harmful, they will find a way to avoid making a big claw-back order, and instead keep the total amount reasonable and stretch out the re-payment plan so that there would not be a huge impact on the child’s life.
The most direct approach I have come across was a decision by Justice Kozak, who used the adultry/fruad angle as a factor in setting the amount of child support lower that it normally would have been. (Coincidentally, he was particularly well respected locally for his bankruptcy work. Since he and a few other local judges retired, they have been replaced by judges who previously were family lawyers. Take that for what you will.)
Similarly, it is common for child support to be adjusted if there was an overpayment made in the short term (for example, on Tuesday I will be dealing with a matter in which the hubby has been paying for day care for a year, only to learn that the child has not been in day care at all), but courts are hesitant to go too far back into the past, or to claw-back amounts that will make a significant difference in the child’s life. By the same token, the courts are hesitant to go too far back into the past in dealing with support arrears if doing so will truly destroy the payor (so if someone is owed child support arrears, they would be better to chase after it earlier rather than later). To a very great extend, courts try to protect the child and be as fair as they can to both parties, taking a “where do we go from here” and “you can’t get blood from a stone” approach.
If one were to step outside of family law, and simply sue for damages due to fraud, the odds are vey high that the court would simply toss out the matter on the grounds that the family law statutes set out a complete ouvre, so if family law does not offer relief, then it is because such relief should not be granted. I don’t have it handy, but there is solid case law on this sort of thing (as a learned friend so kindly provided a few years ago when I made a run at stepping outside family law to do something in the realm of family law but not specifically addressed by family law). I’m not saying that it is impossible – I’m just saying the odds are quite bad. A further hurdle would be the two year tort limitation period, which would prevent the cuckold-dad from suing after so many years from the date he learned of the fraud.
If cuckold-dad ends up on the skids later, there’s nothing to stop him from suing his own adult child for parental support.
The law is on the books (FLA s.32), and I expect we will see more parent support claims in the next few years given that boomers are retiring on investments that have tanked.