If the two clubs want to contribute money to Reyes' family, then I would argue there are much more worthy causes, but it's their money and they can do what they like. And by that same logic; no one can say they should look after the family or have a responsbility to do so.
Jose Antonio Reyes was a very rich man when he died. In that sense, his family will be more alright that 98% of the population of planet earth.