As Frances suggests, the 69 is the schedule number. The address should probably be read as "a farm on Ballachrink" as opposed to a cottage or house on Ballachrink.

The John Cain who married Julia in Nov 1885 may not be the one in your census extract. Their ages are given as 27/25 and 37/36 in the 1891 and 1901 censuses.

The 1891 Onchan cesnus has
John Thomas Cain, head married, 22, ag lab, IoM
Mary Jane, wife, married, 20, IoM
Thomas Edward, son, 5 months, IoM