I would appreciate some advice regarding this (presently hypothetical) situation.......

My wife who lives with me in the UK, has a younger brother presently studying for a law degree at Tamesat University, upon completion of this degree and final grades permitting. He wants to come to the UK to study for a one year MSc in International Law (I myself fail to see how this qualification is relevant to Thai law ).

My wife (and to a lesser degree her family) are pressing me for a loan to cover his stay in the UK, which will cover: course fees, traveling expenses, study materials, and any other incidental costs. I live quite close to the intended place of study, so he will live rent free in my house.

On prevoius occasions I have lent my wife money interest free (to bridge the gap) when buying land in her village, the money has always been repaid in full by the agreed date. This time however the amount involved takes it to a whole new level.

The brother is the youngest of a family of five siblings, the rest are elder sisters.
He is by Thai standards very intelligent, however he also exhibits most of the well known and typical Thai male traits, mainly due to his familly all doting on him, with new clothes, new phone, new laptop, new tablet computer, new moped, etc, etc, all been provided on tap courtesy of his sisters. From what I hear and see, now that he is a student they also give him a monthly allowance, which from his Facebook page seems to fund quite a hectic social life.

My wife has a number of part time jobs, the income from which she is proposing to repay his loan herself, which will place her under considerable financial strain when taken with other financial commitments she is already honouring, and will take her some considerable time to repay. I am also concerned it will become a cause of friction between us.

My proposal is to loan the brother the money, interest will be charged for the loan duration (at a competitive rate and lower than say Thai Farmer bank), the loan will be secured against a Channote (the channote is worth approx 4 x the loan value, the land is the property of two of the sisters, and until the loan is repaid the channote will reside with me in the UK). It is my intention that the brother will repay me the loan (and not my wife) this will teach him the true value of money, and also it will introduce for him to a degree of financial responsibility he has previously not experienced to date.

My wife works tirelessly for the benefit of her familly back in Thailand, and has on numerous occasions given over money which she knows will never be repaid. This is one more financial burden she does not need, but Thai thinking is at present preventing her from seeing this.

As you can well imagine my proposal has not been well recieved, however as far as I am concerned this is a take it or leave it offer.

Do you think I am been fair ? how would I go about tieing the debt to the channote ? and is this practical ?

Thanks in anticipation of your carefully considered responses.