Verb conjugation of "nullify" in English

Since my wife is pregnant, we must postpone the trip until tomorrow. I am back again in Poland in June and then I would be very happy to meet you. I will email the exact dates a little later.
I usually do not travel, and if I do, then only to England, when I visit my parents who live in a suburb of London. I can not afford to travel too much, because it is a very large expense.
I apologize that I have not written for such a long time! Please call me on my new phone number, that would be great! How is your son feeling, has he been recovering? I am sure that he will be fine.