Can anyone help?

Henry Cunningham was born I believe in Birkenhead in about 1883, his mother Elizabeth/Ellen (nee Crellin) was born in Peel about 1847.
According to a family story, Henry was drowned whilst swimming in Douglas Bay, unfortunaltely I am not sure how old he would have been at the time of death, I do know that the family left Birkenhead after 1901 and stayed in the Isle of Man for some years, so I estimate his death being between 1901 and 1912, which is when his sister Mary was married in Liverpool.

I know this is a long shot, but can anyone shed any light?