The best way to send money to a relative in another country

There are various companies and banks in the market which you can use, however, you haven’t mentioned any specific for sending and receiving then I’ll be bound to tell you only international money transferring companies only, (Non-Banking)

Top 2 company on the basis of safety and availability.

1. UAE Exchange 
   UAE Exchange is a 39 years old company founded in 1980.
   Reason Why it's safe and reasonable :
   UAE Exchange uses the latest 128-bit Secured Socket Layer (SSL) encryption technology, the protocol used by all responsible websites on the internet that prevents any unauthorized person from accessing your account details. The website, at regular intervals, is monitored by Norton Secured-Powered by VERISIGN and is PKI-enabled. We also keep your personal & transactional data safe and confidential.
2. Xpress Money 
   Xpress money is 16 years old company founded in 2003.
   Reason Why it's safe and reasonable :
   Xpress Money: Read this might help you https://www.xpressmoney.com/blog/. Xpress Money is part of Finablr, a global platform for Payments and Foreign Exchange solutions. With deep regulatory know-how, technology expertise and industry-leading partnerships, Finablr companies provide a broad array of tailored and trusted financial solutions for consumers and businesses. With a global reach spanning 170+ countries, Finablr companies processed over 150 million transactions in 2018, managing nearly USD 115 billion for customers

There are more money transmitting companies which are there in the market but they are not universally available.