I've found that it's more challenging to remain humble with your family at home than with outsiders, especially if you happen to be the head of the family. I believe it's because your family already knows you well and your feel comfortable remaining the same you. While with others, wanting to make a good impression on them helps motivating you to appear more humble. In either case, we fall short of being truly humble. To remedy this, we need the Holy Spirit to fill us with compassion for all, family members or non-family members.