REVISED: When her beloved grandma passes away, an estranged young woman must find a way of fulfilling her grandma?s last wish while struggling to reconnect with her dysfunctional family at the funeral.

So family...

Best to avoid repetition and use details that build on one another in a concept.

Perhaps she struggles to connect with a particular family member instead of the whole family? Describe who died instead of a generic family member. Who specifically does she need to catch up with? Brother, sister, twin, etc...

The good news is, I have known a couple of somewhat dysfunctional families where funerals are basically family reunions. It is the only time they can seem to put aside their differences and get along for a couple of days.
As a result, I think some people could relate to the situation.

The bad news is, it seems to be missing that 'one extra thing' because catching up with family is a very normal activity if you haven't seen them in a while.
This is a good set-up but I think it needs a hook in order to grab the reader.

Sounds too much like?Death at a Funeral ?(2007). ?Make sure it's not.