有关申请人和随行子女就此行为会不会被取消身份，看下面的解释，应该不会被取消身份。但我建议有可能的话最好找移民律师。
The undertaking is a binding promise of support, meaning that it is your( 担保人)responsibility to support the applicant(s) for the length【三年】 of the undertaking period even if your situation changes. The undertaking will stay in effect for the length of the undertaking period, even if your situation changes. The undertaking won’t be cancelled, even if:
1，the person (你本人）you sponsor becomes a Canadian citizen
2，you【担保人】 become divorced, separated or your relationship with the sponsored breaks down
3，you or the person you sponsor move to another province or country
4，you have financial problems
Sponsor your spouse, common-law partner, conjugal partner or dependent child – Complete Guide (IMM 5289) - Canada.ca
Sponsor your spouse, common-law partner, conjugal partner or dependent child – Complete Guide (IMM 5289)