Any advice on how I should go about discussing financial matters with my parents?

Firstly, we need to have a complete understanding on our cashflow. Through this process, we will understand our earning ability and spending habit. Here is a guide to help you: https://www.blog.pzl.sg/understanding-your-pers...

With the cashflow completed, share it with your parents and allow them to understand on what is going on. Brainstorm the situation together openly and find solutions that work for all parties.

Thereafter, analyse the business and find out its profits and loss. Improve the business model if necessary to ensure long-term sustainability. If not, discuss on alternative measures to improve liquidity.

In any case, you should always do your own budgeting and save some money regardless of the situation. Here is how I do mine: https://www.blog.pzl.sg/how-to-create-a-monthly...

The discipline and the need to have a budget is even more important as your finances is pivotal to the family. Therefore, having some savings on your own is a must.

Talk together as a family and let them understand your perspective. With proper financial planning and the willingness to discuss openly, I am sure all will be well. =)

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When you mention 25k - do you mean what you have paid cumulatively

Apart from my dad not being in financial difficulty, I find similarities between yours and my situation in terms of age of parents, also 5 room flat, with one older sibling.

All of my family members (3) do not have any savings apart from me. Which is why I over-compensate and save alot, because I am not saving just for myself but also for the family unit.

Apart from getting them to reduce their expenses, there's not much they can do tbh. So what I do is to try to earn more, spend less, invest more.