Mama Boleslava is the matriarch of the fabulous Malinovsky family to which Müller and Yegor both belong to. She is the oldest family member still alive, winning even over Yegor in age with 200 years.
This picture is just something little cuteness between her and Yegor's worker Ruberdo. And as usually, Yegor doesn't agree. But because Mama Boleslava is a dangerous, angry old woman Yegor doesn't have the guts to actually complain about it
So he has to settle with just giving them a bad eye from a distance.
all the characters (c) me