There are various challenging grandparent styles that can be difficult for parents to cope with, including those who are overly involved or have outdated parenting beliefs. Some grandparents may have a tendency to spoil their grandchildren, while others may not be present at all, which can affect families in different ways. Parents may need to set boundaries with their children's grandparents due to disagreements over parenting styles, but the reasons behind grandparents' behaviors can be complex.