(Image credit: Getty Images) Question : We are in our 60s and comfortably retired. Our daughter wants a $200K advance on her inheritance to buy a home. We're not opposed, but what's the cleanest way to proceed to avoid resentment? We already paid $75K for her wedding and chipped in much less for her two brothers' weddings. To our horror, her brothers say we are being sexist! But she earns less than them. Are they right, or are we just recognizing that daughters may need more financial help than sons? Answer : One of the most crucial things you might have to do as a parent, both when your kids are young and when they're grown, is avoid favoritism. If it seems like one sibling is receiving preferential treatment, your kids may come to bear ill feelings not just toward you, but toward each other. From just $107.88 $24.99 for Kiplinger Personal Finance Become a smarter, better informed investor.…