There is no "wait" period to sponsor you or your in-law Parents/Grandparents. The most important factor in this scenario is wheather your "total household income" for the past 3 years would meet (or exceed) the required income?Thank you , i will have to apply for my in laws later then. Whats the wait period to sponsor my in laws after we apply for my parents, because my wife and I are sponsoring them together.
And what I meant by "total household income" is that, you will take your income on line 150 of NOA, add that of your spouse, you will get the "total household income"
Hope this help