Farming simulator series

this Farming Simulator 15
http://store.steampowered.com/app/313160/

though that might not be what your looking for as that is more of a true sim then the usual farming sim

Farm Your Life

http://store.steampowered.com/app/266390/

is not a bad one and might be one your mom also likes as it is more FarmVille like if she likes that sort of thing

There is Farm Frenzy
http://store.steampowered.com/sub/2988/?snr=1_7_7_151_150_1

not a lot of choices on steam might be more choices if you go else where

Sadly i wish they had Harvest Moon

anyhow i hope i have helped some

Farming Simulator 15 is the best, the addition of Zombie Horde Mode and QTEs truly vivified the series.

Farming Simulator 15 is the best one, there are more stuff to do in it.
But there are not any tractor's named Belarus, but you can download mods and im sure they have a Belarus mods.
Maybe some of these?