How do I get closer to a sister I wish to marry, with the consent of the family?

If a person feels an inclination towards a woman, marriage is the lawful path, by proposing to her through her guardian. It is not permissible to take unlawful paths such as getting to know her or frequent communication, for these are among the ways of Iblis. One must approach houses through their doors and follow the lawful way, and there is no harm in inclining her with a gift through her guardian.