Hello Moray,
First of all my sincere condolences for the loss of your friend´s son. One of the most difficult things to bear in this world is the death of a child.
I hope you can raise enough funds to help your friend.
We recommend him to obtain a birth certificate of his child and legalize it with the Hague Apostille, and also prepare a Power of Attorney so a lawyer can appear at the courts in his behalf as he cannot travel to Spain. If you are unable to raise enough funds and he can´t afford the services of a lawyer, he can apply for free legal assistance. This will require some work from his side and jumping on various bureaucracy hoops, but he can´t be stopped from exercising his rights to follow the court case for his son´s death, request the death certificate, autopsy, etc
Regards,
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