Salam to them, going to meet them, spending time with them, talking to them, treating them with kindness. (Kitab Ad-Durar-ul-Hukaam, vol. 1, pp. 323)

If he is in a foreign country, he should send them letters

If a person is in a foreign country, he should send letters to his relatives; he should continue to have correspondence with them so that the relationship does not break between them. If possible he should come back to his country and refresh his relations with relatives. It will increase love.

(Rad-dul-Muhtar, vol. 9, pp. 678)

(It is also useful to contact them through mobile phone or internet; in this age of technology, communication with each other has become very easy; people can contact each other no matter wherever they are in the world.)

If a person is in a foreign country and his parents call him, he will have to come

If someone is in a foreign country and his parents call him, he will have to come. Writing a letter [sending mail, calling or contacting through internet] is not sufficient. Similarly, whenever his parents need him, he has to come back and serve them. After father, comes the status of paternal grandfather and elder brother as elder brother has the status like father. Elder sister and maternal aunt have the status like mother. Some Islamic scholars have said that uncle is like father and the same thing can be derived from the blessed Hadees that says عَمُّ الرَّجُلِ صِنْوُ اَبِـیْہِ (Tirmizi, vol. 5, pp. 422. Hadees 3783) (i.e. a person’s paternal uncle is like his father). Other than them, sending letters or gifts to other relatives will be sufficient. (Rad-dul-Muhtar, vol. 9, pp. 678)

Which relative should be met when?

We should meet our relatives with gaps, that is, on alternate days as it increases love and affection more or rather we should meet close relatives every Friday or once a month. All the tribes and family should be united, when they are right and all should struggle jointly to show the truth.

(Kitab Ad-Durar-ul-Hukaam, vol. 1, pp. 323)