Got retrenched recently and stressing up over living well in Singapore.

I am considering moving my parents and myself to jb and would like to seek inputs to assess if it is feasible and sustainable to stay in jb?

I am 41 and parents are in their 70/80s.

I intend to rent whole unit hdb to finance the expenses in jb and parents will sell off their hdb and we will use that amount to get a property in jb.

please input.
Did you just come up with this idea due to your retrenchment/desperation or you have this planned out for some time already? Is that your own decision or you have already aligned with your parents about the thoughts.
It does make a big difference whether you are mentally prepare for the culture difference between the two states? Just like what others have other commented, why not just rent out both the HDB flats and rent a place in JB to try it out first before deciding whether to buy a property that you may ended up regretting. You should only consider purchasing a Property there if you are very sure that you are going to stay there for long.
I see quite a few cases when people simply purchase without proper thinking and planning, ended up stuck with the property due to the poor demand due to the 1M cap imposed on foreigner property purchase. As Singaporean, i am not sure whether you are aware on the rule for foreigner property purchase. I think its going to be very important for you to know about the property ruling imposed on foreigners if you are seriously thinking to buy one.
Personally, i am planning to move there for my future retirement and I think I am quite well blended into the environment since i have stay there in the past before and I am travelling frequently across the causeway almost every weekend. But for your case, with your parents, it might take further considerations.
Everyone has their own preference on their personal backup/retirement plan, so for me, i am just planning for my own rainy day in case i got retrench or decided to call it a day. However, if your decision is purely based on the spur of the moment, i will seriously advise you to think twice.
All the best to your next possible job opportunity.