Helps his granny clean the rooms тут опечатка или нет? helps to clean ? в тексте отсутствует "to"

Нет, это не опечатка. возможны оба варианта - to help do something и to help to do smth

После help можно употреблять to, а можно и не употреблять she helps me to clean.  she helps me clean  оба варианта правильны

When my summer holidays came i was very happy!   the weather was fine so my friends and i went for a walk every day. it was fun! then i spent a month in the country where my grandfather and grandmother lived. it was great. i drank milk and ate a lot of tasty food which my granny prepared for me. i have many friends in this village because i go there every holidays. we played football and tennis every day! there is a small river near the forest and we swam when the weather was fine. it was great!   i liked my holidays very much.    

My  holidays, as always, i  spent  with my grandmother in the village. i love to live there. next to the house there is a small forest and a river.   we  swam  and  sunbathed,  walked  in the forest,went hiking, had picnics  and, of course,  i  helped  my grandmother in the garden.    august  was  the most interesting month. finally, my dream  came  true, and my parents and i  went  to kiev. it  was  great! our relatives  showed  us the capital of our country. it  was  the first time when i  flew  by plane!   we ate out in a restaurant, walked around a park, visited many museums and  saw a lot of  art exhibitions, went to a fontain.the second half of august i  was  at  home.