If I waive my request for reimbursement for administration costs from an estate, can I later reinstate my claim?

Question Details:

My administration costs are high because of travel (I was advised that the court would not likely approve them anyway). I am willing to wave my administration costs so my mom, the widow, will not be financially hurt as bad. However, if the attorney that represented me then raises his fees,(likely) I would rather it go to me? Can I revisit that once I have waved it?

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