Ten families received letters, many delivered by sheriff officers, after speaking to the BBC.
The 44-year-old man was pronounced dead at the scene and there were no other injuries.
The five schoolboys have performed the hit on TV, but still found time to give back in their community at a local hospice.
The boys from Denny said they left the message on the doorbell "to get you in the Christmas spirit".
The family of Cole Cooper launched a social media campaign to search for the 19-year-old when he went missing after a night out.
The family of Cole Cooper appealed to the public for help tracing the 19-year-old after he disappeared in May.
Thomas Robb, who had dementia, was 74 when he was reported missing after failing to return home in August 2012.
The 19-year-old was last seen four weeks ago near his home village of Banknock, near Falkirk.
One of the horses could not stand properly in the field at Dennyloadhead and kept collapsing.
