In general:

If the dreamer in a dream welcome, he accepts himself and begins to like himself. If he reveice welcome from family member, now he is accepted by the family and his relations will improve​​.

Psychologically:

To welcome another person in the house means, that the dreamer learns to trust himself. If dreamer belong to a welcoming party, it shows his ability, to belong for a social group with common beliefs.

Spiritually:

Dreaming of the welcome on spiritual level means, that the dreamer is accepted spiritual, and his first steps to spiritual fulfillment are greeted.