Need urgent advice

My boyfriend and his mother are buying a house. The plan is to buy the house next year. It’s an 1 bhk at 1cr 30l.

His salary is around 55k in hand and her salary is 45k in hand. She has a good 5-6 years left for retirement.

They already own a 1rk here but they can’t sell it. So that will get rent of 15 k once they shift. Now they need around 40l for down payment. They have 20l. The question is of the remaining amount.

We also plan to get married in 2026 1st half. Please give suggestions on how to go about it.

The house is mandatory and so is the wedding .

Also he is going to get appraisal in the first half of next year around 10 to 12 % He is thinking of switching after that. although he loves to work there but he has heavy heart bec he has no choice.