You got some BOLD coyotes... normally they should have run for cover at the first sight of you & your wife.
Sounds like they need to be taught some "manners"... any center-fire rifle will do that.
Normally, I don't much care for "assault-rifle-look-alikes", but a semi-automatic Colt AR-15 with a 30 round magazine loaded with varmint bullets would do a "number" on all 6 of those coyotes in about 10 seconds flat!
The .223 (5.56mm NATO) round will "reach out and touch someone" (including coyotes) pretty well out to about 250 yards with a good scope.
Good Shooting...
Ron T.