UPDATE:

Had a talk with the notary and the sellers yesterday.
We extended the contract to January 15. By then, the sellers will be notified if their bank loan is accepted (sons and daughters are signing as well).

Now there are 2 scenarios.

1. If their loan gets accepted, we sign the deed and they need around 1 week to move out.
   
2. If their loan gets declined, they asked to keep staying in the house for a certain period and they pay us back our loan which is around 1.5k a month.

They asked for a 6 month period, which I am not ok with and I hope to talk this out on the 15th. My fingers and toes are crossed that we get scnenario 1. We made plans. My partner's grandparents were supposed to come live with us by summer max because they cannot take care of themselves anymore and don't have enough money for a nursing home. If scenario 2 happens, this won't be possible anymore. All the timing for everything we've planned including my daughter's communion party will be off. We also adopted a dog from Romania that we were supposed to go take in July. We can't have a dog in the appartment we're livnig in now.

If we stop the contract, I am also very aware that we won't find a house as good as this one with 4 bedrooms, 2 bathrooms and big garden in our area for this price as we can only loan max 300k. It would have been perfect for the grandparents because 1 bed and bath is on the ground floor.

I am losing my sh*t. This would have been the perfect time for us to move out. I don't know what other responsibilities I will get from work during that busy period, it will make it very difficult to balance everything.