The Cyrillic text shows the name of the recipient: Юрко Кучерук (Jurko Kutscheruk).
She writes to her mother, father, Kolja (either her brother or possibly the nephew Mikola, Микола, who is mentioned by Marija Kutscheruk — this is only speculation, as the name is very common),
sister Ira, and niece Ninka (Nina).
Marija Kutscheruk – here –
writes to her sister, brother, and nephew Mikola (Микола).
All three senders at some point use the wording “we/us,” which could be a hint that they are not alone but with relatives. However, it could also be a stylistic choice, as in “we, the girls” or “we, the workers,” so it is hard to tell.