Humberside Police said Mark was from Withernsea while Sarah and Grace were from Nottinghamshire.
The Lord-Lieutenant, the King’s personal representative for the county, added: “It is a very tragic situation where three people have lost their lives.
“My heartfelt sympathies go out to the families and friends of those involved and also to the community of Withernsea, which is feeling such a tragic loss.”
His office would be “contacting people involved in the awards process to understand which award is the most appropriate”, he added.
Paying tribute, Mark’s family previously described him as “a true selfless hero with a heart of gold, who was so cruelly taken trying to save others”.