My 2nd grt grandmother (at age 42), and 3 of her young children (ages 3-12) all died within months of each other in 1876/77. All were buried at Braddan. Can anyone advise what might have been the cause of these multiple deaths, ie, influenza or ?

I am aware that "official notification of the cause of death was only required from the start of compulsory registration on the Island in 1877..." (Manx Notebook), however unfortunately I do not have death registrations/certificates for these folk.

Thank you for any suggestions.