Read this thread the other day and have been thinking about it since.
I'm a 4th generation small business owner myself (my great-grandfather started the business in 1956), and I have worked with my grandfather, grandmother, father, mother, sister several uncles and a few cousins over my 30 years in the business. Is it stressful working with family - You betcha. Is it a good excuse to be "cranky" with your customers - Absolutely not.
I've been trained since I was 12, do not let your personal problems or disagreements which is going on in back affect your performance or customer service skills out front. Superior customer service is one of the small advantages that small business's have on the "big boys" these days.
Having said that, I recently have been to Kee's and find it an exceptional store. The owner is extremely knowledgeable, and in my opinion has a very nice setup for the hobbyist. He was patient with each customer, and took his time ensuring each customer's questions were answered correctly. My only nitpick was I wish he had more in the way of African Cichlids, but as I well know you can't do it all!