big-brotherish

adjective1

1. •
   Of or characteristic of older brothers.

   • “Did we get him?” he repeated in a scornful, big-brotherish sort of tone. — 1902

adjective1

1. •
   Relating to or suggesting Big Brother (unwarranted, invasive surveillance).

   • [...] a Big Brotherish refusal to grant them respite from administrative vigilance, as though they were children. — 1974