So G is retired and gambles away food money?

Make sure N's assets are safe from G.

If G loses the house, N can invite his mom (or both of them) to stay with him if he wants.

If they suddenly started doing this it can be a sign of dementia. Look out for other signs and consider a conversation with a doctor.

Make a bet with them that they can’t stop gambling.

Talk to N and mother first. Open with your personal concern, and experience - to explain why you care, your good intention, and to give significance/urgency to the issue at hand

Offer your help in supporting them in their efforts. Discuss with them how they see it, the state they're in, what they can do and influence.

I'd consider two approaches - not one or the other, but chase/asses both.

1. Limit access to funds, secure funds for needs
2. Help them (G) with their addiction and spending - this is very dependent on their personality, view, openness, and personality + your approach to them. Working together with N and mother is essential

If they don't want your help, or don't see any approaches as feasible, accept it as it is and that you can only do so much and not help everyone even if it's in your capability and interest.

Check if your country has a Gambling Support hotline and then hand the number to N. They will give proper advice.

Two different solutions.

Solution 1 is to get addiction counseling help for G.

Solution 2 is to take away the financial ability G to gamble.

Hang out with them and show a genuine interest in their feelings. See them on a regular basis, like breakfast every Saturday morning.

When they speak, listen fully. Make sure they are seen for who they really are.

Do what you can to help heal the empty spot they’re trying to fill with their addiction, keeping in mind what you can do is limited.

You cant, ultimately people are responsible for their own actions and short of threatening them you can't to much to stop a person from living life how they want. Its a gamblers choice to gamble just as its a smokers choice to smoke. As much as it sucks to watch like an onlooker to a train wreck, sometimes you have no choice but to watch someone's vices destroy their life and negatively impact their family's wellbeing as a whole. We reap what we sow. G's wife is also somewhat complicit, if theres ever a time and place for wives to make their husbands lives hell or threaten to leave their sorry ass its when the husband gambles their family away into poverty to chase the rush. Sorry to hear about the suicide thing though, that sucks and its understandable why you are sensitive.

You don't. I also don't recommend you marry them.... Happily divorced now 🙄

Gotta break the routine, it's the only way to stop addiction.

Difficult without more detail.

Does G understand the damage they are doing or are they still in denial?

How much control does G's wife have over the household finances?

G needs to want help. And an important means of helping is to prevent him having access to most of his cash. If he can be persuaded to sign over control over his bank accounts, or pay his pension into his wife's account as soon as he receives it, and get a weekly allowance in return, that might help with the impulse control.

But he'd have to want the help. So the first step is getting him to admit that he has a problem.

It may also be worth the family consulting a solicitor. If he's in danger of gambling away the house, there may be legal steps you can take. Including having the casino bar him (but this may depend on where you are, and how many casinos he has access to).

with your help, he can get through this! never give up!

You can help by supporting N and offering to support N's mother. You probably can't help G, but you can help them. You probably can't help N and his mother know how to help G, but you can support them as they try to cope.

Good luck.

When someone is in a hole, you can give them a ladder, but they have to choose to climb up it.