Need help.
Here is the situation.

My cousin brother(who is a Canadian PR) got married(arranged marriage) in India recently. Unfortunately, due to his schedule, he didn't get to spend any time in India after the marriage and returned to Canada.

Within a couple of weeks the girl's parents started calling him 4-5 times a day to keep track of where he was going etc.! (even though he had been in touch with his wife almost every other day.)

They also kept asking him since the day that he landed back in Canada, when he was going to send in the sponsorship application for his wife.
Based on legal advice my brother got, he was told to ask his wife to provide 2 relatives as contacts(those who attended the marriage) as there had been several instances of the Canadian Embassy in India supposedly speaking with relatives to verify the validity of the marriage(due to increased fraud).

The girl's family refused to provide this and started abusing/threatening my brother and his mother(my aunt) since and as you can imagine the whole relationship deteriorated after that..

My question is.. what can/should my brother do to deal with this situation in India. Effectively, they would like the marriage dissolved/annulled.

He has not sent in any sponsorship documents here.
Does anyone know any lawyers in India that might help with this?

I do not have a direct answer or suggestion to your question. But the important issue that needs to be addressed is the legal tangles your relative can be put into by his inlaws(EX).

They can go to court and obtain a PO (not PIO) order against him and he can be harassed by the Indian local police whenever he visits India.This might have also other ramifications if he wishes to remarry in India or even when he wants to exit India and can be stopped by local immigration in the airport if the Inlaws are well connected. He could be even thrown into a cell just for harassment without a case being booked against him which would be quite a shock for a Professional who has never stepped into a police station for other than passport purposes.

I had the opportunity of listening to the CMR 101.3 radio program of Ranvir Chauhan - Asian Connection yesterday and he had a legal counselling program in Punjabi with an expert from Punjab on live radio. Case after Case was similar to yours and whatever I learnt from that program is what I've written above.

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Speech by Thomas Friedman of The New York Times....

"When we were young kids growing up in America, we were told to eat our
vegetables at dinner and not leave them. Mothers said, 'think of the
starving children in India and finish the dinner.' And now I tell my
children: 'Finish your maths homework. Think of the children in India
who would make you starve, if you don't.'"