Uganda's government has recruited the mother of Lord's Resistance Army leader Joseph Kony to try to end the long war.
The talks in Juba have made little progress so far
Nora Oting, along with other family members, is to be escorted to a bush camp in north-east DR Congo, to see her son for the first time in 15 years.
Southern Sudan vice-president Riek Machar, who is hosting adjourned peace talks, will take them there.
The LRA has killed and maimed thousands during the 20-year war. Mr Kony has refused to attend the talks personally.
Ugandan official Ruth Nankabirwa said the talks would be suspended for a week to allow time for Joseph Kony to be persuaded to take part. Previously he has cited security concerns in refusing to attend.
The official warned that Uganda was prepared to attack the rebel camp, should the peace negotiations fail.
When talks resume, Mr Machar said the parties would discuss a ceasefire and the disarmament and reintegration of fighters.
The two sides reached deadlock in the talks which began last week, with government negotiators refusing to sign a ceasefire agreement with the LRA before other issues had been dealt with, saying they might use the occasion to regroup and rearm.
The discussions in southern Sudan are considered north Uganda's best chance of peace in years.