Not in classical Sanskrit. Vedic Sanskrit had pitch accent, which had been lost by the classical Sanskrit era. English has stress accent. But many languages do not have stress accent, and either have pitch accent or syllables are not accented at all.
Great grandfather’s sister’s grandson is your second cousin once removed. That guy is the second cousin of one of your parents because they share great grandparents with one of your parents. A grandparent’s sibling is a great aunt or great uncle to you. A great grandparent’s sibling is a great great uncle or great great aunt to you.