I'll tell you what you DON'T do -- you do not allow your in-laws to baby-sit your daughter until you are absolutely sure your wishes about her care will be followed. will cannot be omitted here. The tense being used after until is the present: you are ...
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I'll tell you what you DON'T do -- you do not allow your in-laws to baby-sit your daughter until you are absolutely sure your wishes about her care will be followed.will cannot be omitted here. The tense being used after until is the present: you are ... sure (that) ... The will occurs in a clause subordinate to the until