Judgement Summons. Power of court?

1) you need a lawyer. a specialist in HK family law. It maybe worth the one time cost to find the answer.

2) It is possible that from a legal perspective, your options are limited. In most countries, judges will not order anything drastic against a deadbeat parent. Your billionair oponent can afford a much longer and more expensive court fight then you can. Worse, he may choose to do it just to p*ss you off.

3) your wife can try to approach the paternal grandparents. If they find some love in their hearts for the grand kids, then all problem are solved.

4) If that does not work, try approach a journalist. Threaten to go public with your story. Prominent HK families are generally affraid of being shamed in public.