@Cathydale
Technically there is no exactly 1/2 the year when there are 365 days in the year ... someone must have had the child at least 1 day longer. If you had the child for 4 months, your sibiling had the child for 4 months and the grandparents had the child for 4 months then NO ONE can claim the child.
Now if you, the grandparents and the child all live in the same house for more than 6 months then the parent (you) has the superior right to claim the child and if you do not then the grandparents can claim the child.
