I am a baptised Catholic but lapsed for a number of years . My sister in law , a devout member , invited me and my wife to Midnight Mass in our local cathedral .
I felt a strong calling again but when my mother-in-law heard this she became most abusive and said I should belong to the same religion as the rest of her family ( Protestant ) . Trouble is my wife lives in fear of her wicked mother and I have to protect her . Going to Mass would make things worse . My wife does not attend any church regularly - and nor does my mother-in-law, and yet she calls herself a good Christian :dancing-banana: . So for the time being I attemd mass in secret lunchtime midweek and midweek Holy Days of obligation .
What do I do - I understand I am not comitting a cardinal sin by conciously missing Mass . Should I go and see my local priest ( whom i do not know )
Elizabeth said some great things here. There are also more who I hope will respond to this who are more experienced than I, but if I might be able to give my 2 cents in this. I think doing some prayers and or a novena may help here.
It sounds like you know that you're doing the right thing in not listening to your mother-in-law about 'belonging to the same religion as the rest of' your wife's family. If you really want to protect your wife, I would say get her away from her mother. No easy way to do this. If her soul is what's at stake here, and her mother is what's keeping her in fear of fufilling her duties to God, and she is, as you say, indeed wicked, than some space is indeed needed, along with prayers for your mother-in-law.
Also, being brutally honest, attending mass in secret, during the week, is probably not the best action for you now, or your family. You are the man, right? We must act like it. A man, a leader, does not need to live his faith in retraction for fear of familiar disputes. God is the highest end, and we must show this to our family, if no one else.
Of course, a priest is of necessity here, so you would be correct in seeking one out. My concern is, do you attend a diocean church, or a traditional chapel? The Society of Saint Pius X has many chapels in the UK, if I'm not mistaken.