I’ve made this recipe regularly at my house. I made a few adjustments to fit my food goals. I use skim milk instead of buttermilk and greek yogurt instead of butter. Doing so added some protein and reduced the fat without having to give up the moist texture. I only use egg whites as well. I still soak it overnight in my fridge. Set it on the counter when I wake up and let it warm to room temperature. I put the batter and the rest of the ingredients in my blender to finish the batter and bake it, and everyone loves chocolate chip cake for breakfast. It fits my trim and healthy mama eating plan as an E meal just barely.
The word dear is considered a term of endearment, not a kinship name. A term of endearment is usually not capitalized, even when used as a direct address.
The Chicago Manual of Style does not recommend capitalizing the word sir.
Regarding the word club in your example, when you refer back to a proper noun using a shortened version of the original name, you may capitalize it, but in this case, since “club” is so generic, we would advise against it. If the group were called the Irish Society, on the other hand, a capital s (for Society members only) might be a good idea.