Medical emergency was with my father, who is no more with us now.
I am sorry for your loss
There is a risk that you won't be allowed in the UK. This risk is already there now and it increases day after day.
You know these officers in dark blue uniform at airport, they have the right to cancel any leave (Tier 2, Tier 4, ILR...) if the circumstances have changed and the person presenting at the border is no longer entitled to that leave.
When you come back to the UK, it will be obvious that you are not working. You know how employers are these days: you are lucky if they give you 2 weeks holidays in a row. If the ECO notices that you have been out for a while on a Tier 2, that's a first alarm that's going to ring in his head. In all probability, he will ask you if you are still working. Once you answer "no", it means you are seeking an entry to the UK as a visitor on a Tier 2 visa that you are no longer entitled to.
It's not always mater of curtailment. They can also deny entry on "change of circumstances". You have a Tier 2, you are not working for your sponsor, even if the visa is not yet curtailed, they can still consider the change of circumstances as strong enough to deny you entry.
Well, in other hand, I know people who go on abroad on holidays 3 times a year on visas they are not even supposed to hold as their circumstances changed but nobody ever challenged them at the border. It's mater of luck really.
Should we carry all the documentation related to my father as a proof and display them at the immigration's in case of any doubt's.
Yes always. If things go wrong, these documents might justify some compassion / discretion.