day, adorable, happiness, summer, sunny, holding, together, sunny day, twins, vacation, love, friendship, youth, lovely, young, harmony, smiling, smiles, twin, sisters, sister, sibling, siblings, life, kids, joy, healthy, identical, health, happy, girls, genetics, friends, fun, family, cheering, daughters, biology, biological, best friends, caucasian, beach, top, woman, riding, back, seashore, standing, science, coast, shore, adult, cf_c, facial expression, juvenile, household, good fortune, encouragement, approval, girl, age group, time off, fortune, discipline, twenty-four hours, crystal, life science, shouting, female sibling, season, smile, holiday, minor, youngster, kinswoman, relationship, prosperity, assistant, skill, worker, leisure, diversion, female offspring, child, cover girl, photographer's model, cheery, young person, compatibility, grin, kid, daughter, wellbeing, grinning, person, friend, characteristic, grownup, model, gesture