Jim (James) Vuk ada Vukovich born Constanta Romania December 28, 1903. He married My Grandmother Mary Danchuck/Magda/Vuk November 24, 1937 In Canada.
He died August 20, 1961 Toronto, Ontario, Canada.
Perhaps obtaining copies of the marriage and death certificates would be a start, as these should probably include some of the detail you need. Other than that, your research regarding Romanian events might be difficult, especially if you do not know the language.
Also, check out the Wiki pages, starting at https://www.familysearch.org/wiki/en/Romania_Record_Finder
Unless you come across a researcher with similar (Romania related) interests, I feel you will be fortunate to gain any specific information on your grandfather's family members.
What have you found out through 'FamilySearch'?
What information are you seeking?
You seem to have the basic details about him.
The info I have presented is from a family member.
Thank you Paul for your advice. I will continue searching for different groups and hopefully come across someone working on same family.