骨肉至亲 Of self's own flesh and blood
骨肉相连 Bones and flesh hold together
恩重如山 A great debt of gratitude
返哺之恩 Grace of returning to food of chewing
尊老慈幼 Respect the kind old child
百善孝为先 Filial piety is the most important of all virtues
老吾老以及人之老
Take care of own aged parents first and then extend the same care to the aged people in general