Fennel, dill and parsley are closer relatives to Celery than Coriander is.

Here is a link that might be useful: Current classification

I THINK IT WOULD BE AN INTERESTING CROSS ! Try it ! I would like to see all the possible crosses in the carrot family . These could include : anise, carrots, caraway, celery, celeriac, cilantro/coriander ,cumin ,dill, queen Ann's lace , fennel, parsley , parsnips , And anything else I may have left out .I once crossed queen Ann's lace with carrots and got a lighter orange carrot .