WASHINGTON, 2015-4-28 — /EPR Retail News/ — Families this year are ready to splurge on jewelry, flowers, gift cards, brunch, and apparel for dear old mom. According to NRF’s 2015 Mother’s Day Spending Survey conducted by Prosper Insights & Analytics, Americans will spend an average of $172.63 on mom this year, up nearly $10 from $162.94 last…