Looking at The Hierophant inside out, it can be concluded that there won't be a definite purpose for family reunions. The reversed Pope suggests that one will feel confused and disoriented, with a lack of direction. So, there won't be a real common goal to achieve during family reunions.
The Three of Pentacles indicates the possibility of a block in relation to health. Tensions in the family are likely to lead to some kind of conflict that could prevent all family members from achieving physical or mental well-being.
Based on the tarot cards selected, it seems very likely that there will be tension during family reunions. The lack of a common purpose and the possibility of a blockage in relation to health will cause tensions to be more intense and difficult to resolve. Therefore, the answer is yes: there will be tensions during family reunions.