One of my relative says that mechatronics is not a proper subject and it is also tougher than other engineering branches, is it?

Maybe, he is correct. Mechatronics is a combination of Mechanics and electronics. So it is better than Mechanics and electronics. And at the same time it is tougher than mechanics and electronics. Usually recruiting companies prefers mechatronics students than mechanics & electronics. If u r good in

You need to see the syllabus of mechatronics engineering. It is not that hard as students think. Yes it have some of electrical and mechanical subjects. If you think that you need to write codes in Java, SQL etc. Then its not at all true. Mechatronics engineering is all about the systems engineering

Mechatronics is a proper Engineering subject in which you learn how to make different Mechanical parts. It is not so tough but you have to do daily Study for that. Best of luck for your future and if there's any query, feel free to ask.