I've been getting support from an organisation called Families Reunited UK, who are also campaigning for the rights of children unable to live with their parents because of the current process/income limits.
There are no human rights that allows somebody to choose which country they want to live in The courts take the view that they can have their family life together in their their own country (children get theiir citizenship via their parents), or in the country of the foreign spouse they marry.
The Tier 4 Sudent visa holders and the work visa holders, cannot bring their children unless their spouse is also coming on a dependant tier 4 visa or the work dependant visa. The exception is if the childs other parent has died, or they can prove sole responsibilty
The Graduate visa that the UK brought in for those who have been to university in the UK, does not allow these to bring their spouse and children if they were not already their dependants on their Tier 4 Student visa. They also must apply from within the UK and before their student visa expires. A big change to the previous PSW visa, that foreign students could have. The changing to a work visa before they finished their degree, has also been stopped.
From the January intake, the Tier 4 student visa holder can no longer bring their dependants (partner and children under the age of 18) to the UK, unless they are studying certain degrees.
Many countries won't allow foreign students to bring their wife and child and the student has to prove they have insurance that will cover all their medical bills and any GP visits or emergency hospital visits, before they can have a visa. If they do allow a spouse, they are not allowed to work and they also need full medical insurance.
The Tier 5 Youth Mobility visa does not allow dependants (partner and children) either. They won't get that visa if they have children or they are financially responsible for child. They also have to be young, between ages 18 to 30 to get that visa. Under age 35 if they are a New Zealand citizen and that will soon include Australian citizens too.