First try coming up with some ideas that work with both parents. The ideas above might get your started. Your co-parent's fear is likely valid but there might be a solution. If communication gets fraught, try some of these ideas to smooth it out. Assuming you have talked it to death and cannot come to an agreement, the only remedy is to go to court to compel them. Covid-19 is still largely unexplored legal territory. What the judge determines may depend upon the judge and your specific situation. Elements in your specific situation that could impact the decision might include high-risk individuals in your child's family, a high risk situation in your home, or high risk travel. If you are considering going to court, it might be a good idea to get a consult with an attorney in your area to ask their opinion.