Did they make purchases of prints or are they in a decision mode? You say they liked about 15 of them. As unfortunate as it is and yes, word of mouth can be a detriment however, you've got satisified customers that use word of mouth also. Since you aren hearing this through a thrid party, I wouldn't approach them on the matter. If the mother does contact you to "yell" then you have your claim that they insisted on working in less that ideal conditions, against your better judgement and offer them a discount session to reshoot. In the future, you might have to be more forceful in your rescheduling when you know the conditions aren't right.
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Lori Putman flickr
~No one can drive us crazy unless we give them the keys
~~Life isn't about waiting for the storm to pass, it's about learning to dance in the rain!
7D | 300L f/4 IS | 135L | 35L | 100/2.0 | 50/1.4
430 EX, 580 EX II Speedlites
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